import time

def promising(i,weight, total):
        return ((weight+total >= W) and (weight==W or weight+w[i+1] <=W))

def s_s(i, weight, total, include):
    
    #아주 조금 빨라지는 개선
    if(weight+total == W) :
        for j in range(i+1,n) :
            include[j] = 1
        print("sol",include)
    
    elif(promising(i, weight, total)==True):
        if(weight == W):
            print("sol",include )
        else:
            include[i+1]=1
            s_s(i+1, weight+w[i+1],total-w[i+1],include)
            include[i+1]=0
            s_s(i+1,weight,total-w[i+1],include)

w = 40*[0]
n=len(w)

for i in range(0,n):
    w[i] = i+1

W=815
print("items =",w, "W =", W)
include = n*[0]
total=0
for k in w:
    total+=k

start_t = time.time()
s_s(-1,0,total,include)
end_t = time.time()

print("time : ",str(end_t-start_t),'s')